I've watched every season and I have to agree. The teams just aren't as fun as some seasons, the legs aren't as cool, it's been less travel-agency-video and more National Geographic.
Some of the problem is definitely the destinations. Some is the chemistry between teams. Rob and Amber are screwing up the whole equation and I hate them for that. Plus they're nasty and I like seeing the nasty folk getting eliminated and so far they haven't been.
I think seasons 2 through 4 have been the best so far.
That about sums this season up for me.